initial commit / add all books

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diff --git a/3161/CH9/EX9.1/Ex9_1.sce b/3161/CH9/EX9.1/Ex9_1.sce
new file mode 100644
index 000000000..f2e27b7a3
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@@ -0,0 +1,33 @@
+clc;

+//page 463

+//problem 9.1

+

+//Input signal strength Si = 0.5 W

+Si = 0.5;

+

+//Gaussian Power Spectral Density n = 10^(-10) W/Hz

+n = 10^(-10);

+

+//Baseband cutoff signal fM = 15 kHz

+fM = 15 * 10^3;

+

+//Maximum frequency deviation Df = 60 kHz

+Df = 60 * 10^3;

+

+//Average power of the modulating signal mt = 0.1 W

+mt = 0.1;

+

+SNR = (3/(4*%pi^2))*((Df/fM)^2)*mt^2*(Si/(n*fM));

+

+disp('SNR is '+string(10*log10(SNR))+' dB');

+

+//Part b

+

+//Required SNR at output>40 dB = 10000

+

+//From (a), required Si/0.5 > 10000/4052.8 

+//Or, required Si > 1.2337 W

+//Since, channel loss is 20 dB (=100), 

+//Required transmitter power > 1.2337*100 = 123.37 

+

+disp('Required transmitter power > 1.2337 x 100 = 123.37 ');

diff --git a/3161/CH9/EX9.2/Ex9_2.sce b/3161/CH9/EX9.2/Ex9_2.sce
new file mode 100755
index 000000000..7c1da149b
--- /dev/null
+++ b/3161/CH9/EX9.2/Ex9_2.sce
@@ -0,0 +1,30 @@
+clc;

+//page 464

+//problem 9.2

+

+//Baseband cutoff signal fM = 15 kHz

+fM = 15 * 10^3;

+

+//Maximum frequency deviation Df = 60 kHz

+Df = 60 * 10^3;

+

+//Figure of Merit for FM is G_FM

+G_FM = (3/2)*(Df/fM)^2;

+

+disp('Figure of Merit for FM system is '+string(G_FM));

+

+//Ratio of Figure of Merits of FM and AM systems is R

+R = G_FM/(1/3);

+

+disp('Ratio of Figure of Merits for FM and AM systems is '+string(R));

+

+Df_new = 2*Df;

+

+//Figure of Merit for FM when bandwidth is doubled is G_FM_new

+G_FM_new = (3/2)*(Df_new/fM)^2;

+

+//Ratio of Figure of Merits of FM and AM systems when bandwidth is doubled is R_new

+R_new = G_FM_new/(1/3);

+

+disp('Ratio of Figure of Merits for FM and AM systems when bandwidth is doubled is '+string(R_new));

+

diff --git a/3161/CH9/EX9.3/Ex9_3.sce b/3161/CH9/EX9.3/Ex9_3.sce
new file mode 100644
index 000000000..f3773ff67
--- /dev/null
+++ b/3161/CH9/EX9.3/Ex9_3.sce
@@ -0,0 +1,27 @@
+clc;

+//page 475

+//problem 9.3

+

+//Resistance R = 1000 Ohm

+R = 10^3;

+

+//Capacitance C = 0.1 * 10^-6 F

+C = 0.1*10^-6;

+

+//Break point for RC filter is f1

+f1 = 1/(2*%pi*R*C)

+

+//Baseband bandwidth of signal fM = 15 kHz

+fM = 15 * 10^3;

+

+Gain = atan(fM/f1)/(3*(f1/fM)*[1 - (f1/fM)*atan(fM/f1)]);

+

+disp('Initial Gain is '+string(10*log10(Gain))+' dB');

+

+//New Baseband bandwidth of signal fM_new = 15 kHz

+fM_new = 2*15 * 10^3;

+

+Gain_new = atan(fM_new/f1)/(3*(f1/fM_new)*[1 - (f1/fM_new)*atan(fM_new/f1)]);

+

+disp('Final Gain is '+string(10*log10(Gain_new))+' dB');

+

diff --git a/3161/CH9/EX9.6/Ex9_6.sce b/3161/CH9/EX9.6/Ex9_6.sce
new file mode 100755
index 000000000..6fcea73f4
--- /dev/null
+++ b/3161/CH9/EX9.6/Ex9_6.sce
@@ -0,0 +1,43 @@
+clc;

+//page 495

+//problem 9.6

+

+//Baseband cutoff signal fM = 15 kHz

+fM = 15 * 10^3;

+

+//Carrier filter bandwidth is B = 60 kHz

+B = 60 * 10^3;

+

+//RMS frequency division Df_RMS = 30 kHz

+Df_RMS = 30 * 10^3;

+

+//Let a = Df_RMS/fM for substitution 

+a = Df_RMS/fM;

+

+//Let b = fM/B for substitution 

+b = fM/B;

+

+//Let input SNR 1 be I_SNR1 = 10 dB = 10

+I_SNR1 = 10;

+

+//Output SNR is O_SNR1

+O_SNR1 = (3*(a^2)*I_SNR1)/(1+6*((2/%pi)^0.5)*I_SNR1*exp(-(b)*I_SNR1));

+

+disp('Output SNR is '+string(10*log10(O_SNR1))+' dB');

+

+//Let input SNR 2 be I_SNR2 = 20 dB = 100

+I_SNR2 = 100;

+

+//Output SNR is O_SNR2

+O_SNR2 = (3*(a^2)*I_SNR2)/(1+6*((2/%pi)^0.5)*I_SNR2*exp(-(b)*I_SNR2));

+

+//Solution given in the book is 13.5431 which is fallacious, the correct answer is 24.32444

+disp('Output SNR is '+string(10*log10(O_SNR2))+' dB');

+

+//Let input SNR 3 be I_SNR3 = 30 dB = 1000

+I_SNR3 = 1000;

+

+//Output SNR is O_SNR3

+O_SNR3 = (3*(a^2)*I_SNR3)/(1+6*((2/%pi)^0.5)*I_SNR3*exp(-(b)*I_SNR3));

+

+disp('Output SNR is '+string(10*log10(O_SNR3))+' dB');